[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [PATCH] Add support for ESRT loading under Xen
This is needed for fwupd to work in Qubes OS. Signed-off-by: Demi Marie Obenour <demi@xxxxxxxxxxxxxxxxxxxxxx> --- drivers/firmware/efi/esrt.c | 34 ++++++++++++++++++++++++---------- drivers/xen/efi.c | 33 +++++++++++++++++++++++++++++++++ include/linux/efi.h | 10 ++++++++++ 3 files changed, 67 insertions(+), 10 deletions(-) diff --git a/drivers/firmware/efi/esrt.c b/drivers/firmware/efi/esrt.c index 2a2f52b017e736dd995c69e8aeb5fbd7761732e5..c0fc149a838044cc16bb08a374a0c8ea6b7dcbff 100644 --- a/drivers/firmware/efi/esrt.c +++ b/drivers/firmware/efi/esrt.c @@ -244,22 +244,36 @@ void __init efi_esrt_init(void) struct efi_system_resource_table tmpesrt; size_t size, max, entry_size, entries_size; efi_memory_desc_t md; - int rc; phys_addr_t end; - if (!efi_enabled(EFI_MEMMAP)) - return; - pr_debug("esrt-init: loading.\n"); if (!esrt_table_exists()) return; - rc = efi_mem_desc_lookup(efi.esrt, &md); - if (rc < 0 || - (!(md.attribute & EFI_MEMORY_RUNTIME) && - md.type != EFI_BOOT_SERVICES_DATA && - md.type != EFI_RUNTIME_SERVICES_DATA)) { - pr_warn("ESRT header is not in the memory map.\n"); + if (efi_enabled(EFI_MEMMAP)) { + if (efi_mem_desc_lookup(efi.esrt, &md) < 0 || + (!(md.attribute & EFI_MEMORY_RUNTIME) && + md.type != EFI_BOOT_SERVICES_DATA && + md.type != EFI_RUNTIME_SERVICES_DATA)) { + pr_warn("ESRT header is not in the memory map.\n"); + return; + } + } else if (IS_ENABLED(CONFIG_XEN_EFI) && efi_enabled(EFI_PARAVIRT)) { + if (!xen_efi_mem_desc_lookup(efi.esrt, &md)) { + pr_warn("Failed to lookup ESRT header in Xen memory map\n"); + return; + } + + /* Recent Xen versions relocate the ESRT to memory of type + * EfiRuntimeServicesData, which Xen will not reuse. If the ESRT + * is not in EfiRuntimeServicesData memory, it has not been reserved + * by Xen and might be allocated to other guests, so it cannot + * safely be used. */ + if (md.type != EFI_RUNTIME_SERVICES_DATA) { + pr_warn("Xen did not reserve ESRT, ignoring it\n"); + return; + } + } else { return; } diff --git a/drivers/xen/efi.c b/drivers/xen/efi.c index d1ff2186ebb48a7c0981ecb6d4afcbbb25ffcea0..b313f213822f0fd5ba6448f6f6f453cfda4c7e23 100644 --- a/drivers/xen/efi.c +++ b/drivers/xen/efi.c @@ -26,6 +26,7 @@ #include <xen/interface/xen.h> #include <xen/interface/platform.h> +#include <xen/page.h> #include <xen/xen.h> #include <xen/xen-ops.h> @@ -40,6 +41,38 @@ #define efi_data(op) (op.u.efi_runtime_call) +static_assert(XEN_PAGE_SHIFT == EFI_PAGE_SHIFT, + "Mismatch between EFI_PAGE_SHIFT and XEN_PAGE_SHIFT"); + +bool xen_efi_mem_desc_lookup(u64 phys_addr, efi_memory_desc_t *md) +{ + struct xen_platform_op op = { + .cmd = XENPF_firmware_info, + .u.firmware_info = { + .type = XEN_FW_EFI_INFO, + .index = XEN_FW_EFI_MEM_INFO, + .u.efi_info.mem.addr = phys_addr, + .u.efi_info.mem.size = ((u64)-1ULL) - phys_addr, + } + }; + union xenpf_efi_info *info = &op.u.firmware_info.u.efi_info; + int rc; + + memset(md, 0, sizeof(*md)); /* initialize md even on failure */ + rc = HYPERVISOR_platform_op(&op); + if (rc) { + pr_warn("Could not obtain information on address %llu from Xen: " + "error %d\n", phys_addr, rc); + return false; + } + + md->attribute = info->mem.attr; + md->type = info->mem.type; + md->num_pages = info->mem.size >> XEN_PAGE_SHIFT; + md->phys_addr = info->mem.addr; + return true; +} + static efi_status_t xen_efi_get_time(efi_time_t *tm, efi_time_cap_t *tc) { struct xen_platform_op op = INIT_EFI_OP(get_time); diff --git a/include/linux/efi.h b/include/linux/efi.h index d2b84c2fec39f0268324d1a38a73ed67786973c9..0598869cdc924aef0e2b9cacc4450b728e1a98c7 100644 --- a/include/linux/efi.h +++ b/include/linux/efi.h @@ -1327,1 +1327,11 @@ struct linux_efi_coco_secret_area { +#if IS_ENABLED(CONFIG_XEN_EFI) +extern bool xen_efi_mem_desc_lookup(u64 phys_addr, efi_memory_desc_t *out_md); +#else +static inline bool xen_efi_mem_desc_lookup(u64 phys_addr, efi_memory_desc_t *out_md) +{ + BUILD_BUG(); + return false; +} +#endif + #endif /* _LINUX_EFI_H */ -- Sincerely, Demi Marie Obenour (she/her/hers) Invisible Things Lab
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